CCleaner Portable

At a Glance

You may already know the desktop version of CCleaner.
Make sure you download the portable version of Piriform's Registry
cleaner and repair tool as well. Aside from finding and deleting
broken items in the Windows Registry, CCleaner Portable cleans out
bits of Internet Explorer that can compromise your privacy (such as
the cache and cookies), deletes chkdsk file fragments, manages
restore points, and does an assortment of other tasks.

Note: This download link takes you to the
vendor's site and automatically downloads the latest version of the
software. This program is donationware. It is free to try, but the
author accepts and encourages donations towards further
development.